Patrick Lee Swee Ching was arrested last week by the Corrupt Practices Investigation Bureau, the company said in a statement released Monday. He was released Saturday and has returned the U.S. and has resumed his duties with VT Systems, the company said.

VT Systems is the U.S. holding company for Singapore Technologies Engineering Ltd. ST Aerospace Mobile employs 1,500 at Mobile's Brookley Aeroplex, and VT Halter Marine employs 1,500 at shipyards in Pascagoula, Moss Point and Escatawpa.

VT Systems said in its release that it believes the Singapore government is investigating transactions involving former and current employees of ST Marine. Two current and one former employee of ST Marine have also been arrested and released on bail by the bureau, the company said.